Allow gyp to generate 64 bit project files for VS2012.

Visual Studio 2010 express was the last version to not support 64 bit
configurations.

BUG=angle:714

Change-Id: Ie4383a437a98cecfc82702e766a460ade96062f8
Reviewed-on: https://chromium-review.googlesource.com/210824
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
diff --git a/build/common.gypi b/build/common.gypi
index 8428c08..173253a 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -194,7 +194,7 @@
             },
             'conditions':
             [
-                [ 'OS == "win" and MSVS_VERSION != "2010e" and MSVS_VERSION != "2012e"',
+                [ 'OS == "win" and MSVS_VERSION != "2010e"',
                 {
                     'Debug_x64':
                     {